The act of a man concealing his erection by tucking the top of his penis behind his belt, or in a beltless situation, behind the waistband of his pants to hold the penis in place against his body, thus keeping the bulge hidden and preventing eye injury.

Does not work with tight fitting pants, (unless a long shirt is being worn un-tucked) .

The well endowed man must be careful with this technique as his junk can peek out above the waistline, and one slip of the shirt could create a situation far worse than just being busted with a boner.

1. Dude, your mom is so hot, I've been beltlooping since we left your house!

2. My morning wood just wouldn't go away today, I had to beltloop it till lunch.